Dear forum members,
According to the scope of work from my construction supervisor, the connection capacity for the house will be 14.5 kW.
Is that sufficient for a modern single-family home with 5 people?
I understand that most appliances are not necessarily running at the same time, but if I imagine that in winter many devices might be used simultaneously, and then a 2 kW hairdryer is added, the limit could be reached.
What would actually happen in that case?
Is it possible to upgrade the connection capacity, or are there restrictions imposed by the utility company?
How does a photovoltaic system affect this? Can it increase the maximum peak power demand of a house, or is it useless if the electrical installation itself is not designed for higher loads?
Thank you and best regards
Tolentino
According to the scope of work from my construction supervisor, the connection capacity for the house will be 14.5 kW.
Is that sufficient for a modern single-family home with 5 people?
I understand that most appliances are not necessarily running at the same time, but if I imagine that in winter many devices might be used simultaneously, and then a 2 kW hairdryer is added, the limit could be reached.
What would actually happen in that case?
Is it possible to upgrade the connection capacity, or are there restrictions imposed by the utility company?
How does a photovoltaic system affect this? Can it increase the maximum peak power demand of a house, or is it useless if the electrical installation itself is not designed for higher loads?
Thank you and best regards
Tolentino
OWLer schrieb:
Since I need to arrange the grid connections this weekend, a quick question to the group: Is 30 kW still sufficient when planning for electric mobility in 2020?
Even with a 22 kW wallbox, it can only draw the full 22 kW for a very short time before the charging management reduces the power.
The cable is planned to be 35 mm² (about 0.0012 in²), and after a quick look at the tables, it should handle significantly more amps than the main fuse of 63 amps. If I later need more than 30 kW, only the main fuse would need to be replaced, or did I misunderstand that?30 kW is perfectly fine.
First, you need to be able to actually use (and get approval for) a 22 kW wallbox. In my opinion, only the Zoe can charge at 22 kW AC. All others, including Tesla, Audi e-tron, Porsche Taycan (the expensive, technologically advanced models) etc., can only charge at 11 kW AC, and I don’t know of any models announced for 2021 that can charge faster on AC. It’s simply fast enough to fully charge even a 90 kWh battery overnight without problems. The “popular” BEV ID.3 has 58 kWh, which fully charges in 5 hours. Progress is happening in DC fast charging, as the goal is to minimize the stopover time. For AC charging (destination charging), 11 kW is already quite good, as described.
Cables are intentionally oversized to reduce losses. If needed, they can carry considerably more current. A 3x63 A fuse is also quite substantial. If more capacity is required later, only the fuses and possibly the meter need to be replaced.
F
FoxMulder2428 Aug 2020 09:42Regarding the same topic, I asked our network provider.
Their response was:
The house connection will be installed with 100A, 66kVA.
I think that will be more than enough for a future charging point (or even two ).
Their response was:
The house connection will be installed with 100A, 66kVA.
I think that will be more than enough for a future charging point (or even two ).
OWLer schrieb:
Even with a 22kW wallbox, it can only deliver the full 22kW for a very short time before the charging management reduces the power. A 22kW wallbox can charge cars for quite long periods, if their onboard charger actually supports that level of AC charging. As mentioned before, many cars can only handle 11kW AC or even less.
The often mentioned power reduction by the charging management mainly applies to much faster DC charging. For example, power can drop quickly from a peak of 170kW down to below 100kW. A Tesla Model 3, for instance, only charges below 22kW after reaching over 90% state of charge.
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